Melting-furnace.



A. W\ CARROLL,

MELTING FURNACE.

v APPLCATION FILED JULY7. 1915. 1,182,893. Patented May 16, 1916.

3 SHEETS-SHEET'I.

A/e xd nder WCar'ra// &thame-is A. W. CARROLL.

MELTING FU-RNACE.

APPLICATION FILED JULYT. e.

Patnted May 16, 1916.

3 SHEETS-SHEET 2.

A. W. CARROLL.

MELTING F URNACE. I-.PPLICATION FLED lULY?. 1915.

Paten ied May 16, 1916.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

ALEXANDER W. CARROLL, OF EI IZABETH, NEW JERSEY.

MELTING-FURNACE.

Application filed July 7, 1915.

To all 'whom it mag/ coccrn Be it known that I, ALEXANDER XV. Cim- ROLL,a citizen 'of the United States, and a resident of Elizabeth, Inioneounty, State ot' New Jersey` have invented certain new and usefulImprovenents in Melting-Furnaces, of which the tollowingis adescription.

My inrention relates to melting furnaces and particularly to 't'urnacestor meltng metals such as brass.

So far as I am aware, there has, up to the present time. been nosuccessful gas furnace built for nelting brass or similar netals. Thefuel generaltv used tor this .purpose is coal, and the turnacesenp-loyed are usually ot' rather crude construction, including merely asuitable grate t'or supporting the fuel, and the necessary draftappliances. The eoal must be ca-refullv introduced into the furnace asit :torns the support for the pot containing the metal to be nielted.Since these pots come into direct contact with the burn-ing coal. theyoften become tractured, thus causing the loss, not only ot' the pot, butalso of a considerable portion of the metal contained thcrein. Becauseof the above considerations, the operation of the nelting furnaces nowin general use is at best slow and ineflicient.

An object' of my invention is to provide a melting furnace occupyingapproximately the same space as a coal t'urnace, but designed to use gasas a fuel, and so arranged that the pots containing the' metal areheated' evenly at all tractured. V

Another object of my inrention is to provide a turnace which shallrequire a COlllparatively slight amount of care in the operationthereof, and which may therefore be op'erated. more frequently and moreetciently than the furnaces now in general use.

Another object of my invention is to provide means for introducing thecombustible'.

points, without danger of being gases into the combustion chamber of thefurnace in such a direction that they are given a whirling movementwithin the chamber and to so arrange the flueas to produce a down draftin the chamber.

Other objects of my invention Will a ppear more fully in thespecification and claim which follow.

Referrng to the drawing, Figure 1 represents a plan View partially insection of a portion of a battery of fnrnaces embodymg Specfication ofLetters Patent.

Patented May 16, 1916.

Serial No. 38,425. i

Referring to the drawing, 10 represents.

the combustion chamber of my improved furnace. This combustion ohanberis preferably divided into two concentric Compartments such as ll, 12 bya wall indicated at 13, which may be of any heat resisting material.This wall` as shown, does not ex'- tend to the top of the combustionchamber, but permits of communication between the two compartments ll,12.

In the enbodiment of ny invention disclosed in Fig. l, I have shown themeans for supporting the pot or container ll to comprise thecross-shaped nember 15 clearly shown in F ig. l, which providescommunicating passages lG froni the inner compart- .lnent 11 into thefine 17. This fiue 17 extends longitudinally of the battery of furnacesbeneath the several conbustion chambers and commnnicates with the stack18 which is provided with a suitable' damper l9. This arrangenient ofthe fine, as is readily seen, produces a down draft in each of thecombustion chambers.

Located within the flue 17 and running longitndinally thereof are thepipes or conduetors "20, 21 which in this case conduct gas and airrespectively to a common conductor or conductors such as 22 which inturn communicate with the combustion chamber of each fnrnace. Ipreferably arrange these conductos 9 to enter the combustion chamberatan angle, so that the gases which are introduced into the combustionchamber are givcn a whirling movement. I pret'erably also use aplurality of these conductors 22, in order that the heat due to thecombustion of the gases may be distributed as evenly as possiblethroughout the ehamber.. By passingthe conductors 20, 21, through thefine 17, the gases' carried by the conductors are eftectually heatedbefore they are introduced into the combustion chambers.

In the embodi'nents shown. in Fig. 1, I have illustrated the' conductors22 as comniunicat ingwith the onter compartment 12 of the combustionchanber, so that the combnstible gases which enter through theconduetors 92 into the combustion chamber, pass in a whirling movementthrough the wall 13 and down through the compartment ll into the fiue17. By this arrangement, it p is apparent that while all the heat ismaintained within the combustion chamber, the initial fiame of theburning gases, which is most detrimental to the pot, does not come incontact with the pot. It is apparent also that the burning gases aredrawn down through the compartment 11 upon all sides of the pot, therebyheating it at all points equally.

I preferably provide each :Eurnace With a cover, such as shown at 23,whereby access may be had to the interior of the furnace when desired. Ialso preferably provide each furnace with a removable pan, such asindicated at 25, which fits within a rccess 26 formed below thecombustion chamber of each furnace for catching the metalescaping-fromthe pot or container in case the pot or container shouldbreak. This recess 26 may be closed by means of a door 27 of anysuitable type. e

The main difference form of my invention shown in Figs. 4, 5 and and theform shown in Figs. 1, 2 and 3, is that in the modified form the gasesare introduced into the inner compartment and thence pass into the outercompartnent, instead of first entering the outer Compartment and passingfrom there into the inner compartment. Referring to Figs. 4:, 5 and 6,it is seen that in the modification, the outer compartment 12'communicates with the flue 17' and thus has a down draft producedtherein. The inner compartment is closed to therfiue 17' during theoperation of the device, by some suitable means, such.

as the block 28, upon which the pot or container 14' is adapted to rest.Beneath this block 28 is an opening 29 into the flue 17', whereby, whenthe pot or container breaks, the block 28 may be removed and thematerial from the pot may pass through the opening 29 into the pan 25'and thus be readily recovered.

The conductors 22' in this modification communicate with the innercompartment 11', tangentially, so that the gases which are introducedinto the compartment 11' are given a whirling movement. These gases alsomove upward around'the pot 14:' and thence pass over the wall 13' intothe comartment 12' and finally out through the Ene 17 to the stack.

between the modified Since it requires Very little time to prepare myimproved furnace, for melting a charge of material, I am able to takemore heats than is possible with furnaces using coal as a fuel, and forthis reason I find it adyantageous to make use of some suitable means'or artificially cooling the furnace. WVith this end in View, I haveshown my furnace provided at the top with a water jacket 30.

Reference numerals 10', 18', 19', 20', 21', 23', 25', and 27' in Figs.4, 5 and 6, apply to parts similar respectively to parts 10, 18, 19, 2021, 23, 25 and 27, of Figs. 1, 2 and 3.

The method of operation of my improved furnace should be obvious fromthe above.

The advantages 'of my furnace over those heretofo're in use should alsobe 'readily recognized. -For example, I eiiect considerable economy inoperation by eliminating the necessity of 'skilled labor, and'byreducing the possibility of fractu'ring the pots. Also I make itpossible to take more heats in a given time in one furnace, than hasbeen possible heretofore, thus reducing the overhead expense.

It isto be understood that I do not wish to limit myself totheidisclosure herein, sinceobviously many changes may be made in theapparatus described, by those skilled in the art, without departing fromthe spirit of my invention.

lVhat I claim is:

In a melting furnace, the combinaton of a combustion chamber, a walldividing the lower portion of said clamber into two concentricconpartments communicating at the top, means located in the innercompartment for supporting a container for the material 'to 'be melted,conductors for introducing combustible gases into one of saidCompartments, in such a direction that they are given awhirling-movement, and a flue located beneath said chamber andcommunicating with the other compartment and adapted to produce a downdraft therein, said conductors being located in said fiue, whereby thegases are heated before they are introduced into said chamber.

In 'testimony whereof I have signed this specification in the presenceof two subscribing witnesses..

ALEXANDER W. CARROLL. VVitnesses:

VVALTER S. JONES, M. M. RIEMANN.

Capin i? this patent may 'he obtained !or five cents each, by addressingthe "Commisslouer of rtet.

' washington, D.

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